I get 30 miles per gallons too!! Anywhere from 2-3 gallons that is!! He must be running the hydrogen bomb thing I tried!! LOL He's prolly using the gas guage to measure.. what a tardo!

 

He has a Magic Ram methinks lol

Smaller tires would show more mileage, not bigger tires.

For a fair comparison
Divide km by 1.6 to get miles. What you refill the tank in litres divide by 3.8L for the US gallon (not our 4.54L imp gallon) Divide mile by gallons, you will not get close to 30mpg.

5.2 4x4, got 16mpg highway at best, 13max city
5.9 Indy, na mild top end, everybolt on & ramairbox (before inj/laptop tuning/270rwhp) got a high of about 19mpg highway but running real lean. Most of the time, I would see 12-14mpg max on avg tank with more city than highway. Boost, 11-13mpg combined.
8.0 4x4, 12.2mpg best highway, towing Indy to the track. Combined city/highway usually 10-11mpg. Worst city, 4mpg. Had a ton of snow back in Feb 07, barely got it out of 2nd gear. (198km/129L)

 

Call me an idiot, but you'll have to explain that to me.

Lets say your stock tire is size A, and your new tires (henceforth called size B) are 50% larger. So if you move your truck one tire revolution with B sized tires, your speedometer, thinking you have size A, will think you went 1.5 revolutions.

What am I missing?

 

Viper said it all. No wait, I'm wrong. I get 459,302 miles on one gram of kerosene. So there.

 

BULL ****!!!!
****ing Canadians.

 

When you install bigger tires, they do not rotate as many revolutions as the smaller tire, hence making the speedo read less MPH (and miles per tank) than the smaller tires would. Therefor, bigger tires would make you THINK you were getting worse mileage.

Maybe he's running a set of 28" swampers?

 

a smaller tire turns faster.. just say and 30in tire and (baby dayton) 15in tire the dayton will have to go twice as far as the 30in....... so if you were doing 40 it would say 80, and math wise it would double the mpg

 

Nope i get 5 kms to 1 liter maby 8kms if im babying it lol

 

I confused

 

I was talking about the guy who started this post, not you, I dont even understand the km's a liter thing haha. what i was saying was that maybe the guy who posted this posted km's a gallon and mixed two different calculations and completely throw the whole thing off. like turn the 30 miles into kms then calculate it into miles and instead he is getting 18 miles to the gallon, which is still stretching it, but more believable than 30 miles to the gallon...